STATISTICAL METHODS
The topic entails:-
-
- Defining statistics
- Identifying types and sources of statistical data
- Identifying and describing methods of collecting and recording data.
- Analysis, interpretation and presentation of statistical data using appropriate graphical methods.
- Explaining the advantages of each method of data presentation.
- Study the table below and answer questions that follow:-
CROP | 1978 | 1979 | 1980 | 1981 | 1982 |
COFFEE
TEA PYRETHRUM MAIZE |
1000
750 300 500 |
990
700 250 450 |
870
650 350 550 |
830
700 400 600 |
840
600 450 350 |
(a) (i) Using 1cm to represent 500 tons, draw a compound bar graph to represent the data.
(ii) Give two disadvantages of using the method to represent statistical data.
- The table below shows leading import crops by value (Kshs. Million). Use is to answer
questions a – c
CROP | ||||
Year | Un milled wheat | Maize | Rice | Wheat flour |
2000 | 6,989 | 4,664 | 1,968 | 180 |
2001 | 7,515 | 3,342 | 2,619 | 639 |
2002 | 5,577 | 229 | 2,104 | 237 |
2003 | 6,099 | 1,417 | 2,981 | 168 |
2004 | 6,754 | 4,647 | 3,659 | 200 |
(a) (i) Using a scale of 1cm represents 100,000. Draw a comparative bar graph to represent
the data in the table above
(ii) Give three advantages of using comparative bar graphs
(b) Explain three reasons why Kenya is a producer of the commodities shown in the table
above yet she imports the same
- The table below shows milk production in ‘000 units in selected Districts
District | 1982 | 1992 | 2002 |
Trans nzoia | 24 | 26 | 40 |
Kiambu | 23 | 25 | 31 |
Meru | 25 | 27 | 32 |
Bungoma | 12 | 14 | 20 |
- a) i) Using a vertical scale of 1 centimeter to represent 10,000 units, draw a compound
bar graph to represent the above-given data
- Study the figure below and use it to answer question 6. The figure depicts the proportional
divided circles showing the extent of network coverage in Kenya between 2007 and 2009
- a) i) State four deductions that can be made from the above representation
ii)State three advantages of using proportional circles in representing data
- The table below shows four principal crops produced in Kenya in the years 2000 and 2001.
Use it to answer questions.
CROP AMOUNT IN METRIC TONS
YEAR | 2000 | 2001 |
Wheat
Maize Coffee Tea |
70,000
200,000 98,000 240,000 |
13,000
370,000 55,000 295,00 |
(a) (i) Using a radius of 5 cm, draw a pie chart to represent crop production in the year 2000.
(ii) State two advantages of using pie charts.
(b) Calculate the percentage increase in wheat production between the years 2000 and 2001.
- Study the data given and use it to draw a pie chart showing mineral production in Kenya;
Mineral | Amount (000 tonnes) |
Gold | 26 |
Flouspar | 14 |
Soda ash | 32 |
Zink | 28 |
(a) Using a radius of 5cm, draw a pie chart to represent the above data
(b) List three advantages of using a pie chart in representing data
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